/*
   Copyright (c) 2011 Mizar Tools Contributors (mizartools.org)

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
/*  Contributors :
 *	2011-02-05 Marco Riccardi - initial implementation
 *
 */
package org.mizartools.system.xml;

import java.util.LinkedList;

import org.mizartools.system.ElementParseException;
import org.mizartools.system.INode;
import org.mizartools.utility.xml.XMLElement;

public abstract class Inference extends Justification {

    private enum MySubclass { ErrorInf, By, From,}

    public static boolean isInference(String className){
        boolean found = false;
        for (MySubclass mySubclass :MySubclass.values()){
            if (mySubclass.name().equals(className)){
                found = true;
                break;
            }
        }
        return found;
    }

    public static Inference newInstance(INode parentNode, LinkedList<XMLElement> xmlElementList) throws ElementParseException {
        XMLElement xmlElement = xmlElementList.peek();
        if (!isInference(xmlElement.getName())){
            throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "XMLElement is a " + xmlElement.getName() + " not a subclass of Inference", xmlElementList);
        }
        MySubclass mySubclass = MySubclass.valueOf(xmlElement.getName());
        switch (mySubclass) {
        case ErrorInf: return ErrorInf.newInstance(parentNode, xmlElementList);
        case By: return By.newInstance(parentNode, xmlElementList);
        case From: return From.newInstance(parentNode, xmlElementList);
        default: throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "XMLElement is a " + xmlElement.getName() + " not a subclass of Inference", xmlElementList);
        }
    }

        public LinkedList<XMLElement> getXMLElementList() {
            if (this instanceof ErrorInf) {
                return ((ErrorInf) this).getXMLElementList();
            } else 
            if (this instanceof By) {
                return ((By) this).getXMLElementList();
            } else 
            if (this instanceof From) {
                return ((From) this).getXMLElementList();
            } else 
            return new LinkedList<XMLElement>();
        }
}
